Service A/C light. How do I make it stop

[Guest CL_Reatta]

Hi everyone. I already know that my system is low on R-12 and I already know that I have a leak. But yet, my car insists on reminding me with the service A/C light on the IPC. Is there any way to have the light turn off and stay off, or anything so that I don't have to look at the annoying red light all the time. Thanx

[Guest EDBS0]

Switch to economy or heat.

Do not use the air or defrost.

[Guest CL_Reatta]

I would do that except there will be times that I need the defrost and everything else, and the light comes on when I put it on everything else except economy, which I can't do at 6:45 am when its 20 degree's out. I wouldnt mind unpluging somthing or anything, except I need to know what to unplug <img src="http://forums.aaca.org/images/graemlins/grin.gif" alt="" />

[Guest F14CRAZY]

I believe the '90 light will stay on full time no matter what you set it to, which is what Brian is experiencing. I was thinking a pressure sensor could be disconnected

[NYBobP]

I have no mechanical skills, and very little technical experience. I take my '91's into the shop if there is a problem; they give me a bill, I give them a check. However, when the a/c light came on in my '91 coupe parts car (which still drives very well even with 145K), I took some black electrical tape and very carefully and neatly cut a piece to go over the light. That's it. You don't see it. (That will be $82.50). <img src="http://forums.aaca.org/images/graemlins/wink.gif" alt="" />

[Guest CL_Reatta]

$82.50 ummmmmmm put it on my tab. I was thinking about doing that but wanted to see if there was a more permanent method.

[Guest Albert]

Pull the wire off the ac compressor, so it will not come on, then jumper the ac low pressure switch so the computer thinks the system is fully charged..

[Guest CL_Reatta]

But that's just it, I don't know where those wirse are? thanks for your help so far everyone.

[Guest Albert]

the low pressure switch is normally on the reciever tank of very close to it, just follow the lines around, and you should find a switch or two stick in there some where..

[harry yarnell]

Um, this won't do anything in a Reatta. The computer has already shut off the compressor, and the 'low pressure' sensor is a thermal thermister; doesn't work like in the old days.

[padgett]

Short the sensor and the system will go into "overpressure" condition. You need a resistor. Just don't ask me what value.

[Guest Albert]

I had the problem with my 92 bonniville, there is a high pressure switch and a low pressure switch in series, if ether one opens it turns off the ac via the engine computer, if you jumpet the low pressure, when you charge, the compressor will run to take a charge or the compressor will short cycle, and recause an error in the computer, and lock it out. i just disconnected the batter for a few min, by passed the switch and charged it back up.. take a look on the wiring diagram, there will be a thermester to control the AC but not on the low pressure control, it should always be on.. unless its low on refridgerent..

[Guest CL_Reatta]

Ok, thanks a lot for your help guys, I'll make that my little project for the weekend. And if it doesnt work, (or I give up <img src="http://forums.aaca.org/images/graemlins/tongue.gif" alt="" /> ) I'll just use the highly scientific tape method

[NYBobP]

I you do, I can send you an invoice for my consultation fee. You can use your student discount. Instead of $82.50, we send you a dollar to buy the tape with. However you have to send $2 to cover shipping and handling. <img src="http://forums.aaca.org/images/graemlins/tongue.gif" alt="" />

[harry yarnell]

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I had the problem with my 92 bonniville, there is a high pressure switch and a low pressure switch in series, if ether one opens it turns off the ac via the engine computer, if you jumpet the low pressure, when you charge, the compressor will run to take a charge or the compressor will short cycle, and recause an error in the computer, and lock it out. i just disconnected the batter for a few min, by passed the switch and charged it back up.. take a look on the wiring diagram, there will be a thermester to control the AC but not on the low pressure control, it should always be on.. unless its low on refridgerent.. </div></div>

Nope. low and high pressure sensors are thermisters, and are NOT in series. Both thermisters have one leg grounded, and each of the other legs go to two seperate pins on the BCM.

[Guest DTerry]

Is that the same tape used for the Anti-lock light or is it a different part number? I have some extra anti-lock light tape, and you're welcome to it. <img src="http://forums.aaca.org/images/graemlins/smirk.gif" alt="" />

[89REATTAJIM]

You might check antique shops/flea markets.....belive the stuff people used to cover the flashing "time" displays on vcr's may work for you. <img src="http://forums.aaca.org/images/graemlins/wink.gif" alt="" />